#include <bits/stdc++.h>

#define ll long long
#define ld long double
#define rep(i,a,b) for (int i = a; i < b; i++)
#define irep(i,a,b) for (int i = a; i > b; i--)
#define print(n) cout << n << endl
#define rup(a,b) (a+b-1)/b

using namespace std;

int main(){
    cout << fixed << setprecision(15);
    
    int D;
    cin >> D;
    vector<int> a(D+1,0);
    rep(i,0,D+1) cin >> a[i];

    if (D<=2){
        print(D);
        copy(a.begin(),a.end(),ostream_iterator<int>(cout," "));
        cout << endl;
        return 0;
    }
    
    irep(i,D,2){
        int b = a[i];
        a[i-2] += b;
    }
    int now = 0;

    irep(i,2,-1){
        if (a[i] == 0) continue;
        print(i);
        copy(a.begin(),a.begin()+i+1,ostream_iterator<int>(cout," "));
        cout<<endl;
        return 0;
    }
    print(0);
    print(0);

    //system("pause");
    return 0;
}